Orsay, France
Orsay, France

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Blachot J.,CSNSM
Nuclear Data Sheets | Year: 2012

This evaluation for A = 114 updates one by J. Blachot (2002Bl20), published in Nuclear Data Sheets 97, 593 (2002). Previous: 1995Bl09, 1990Bl05, 1982Bl18. Decay scheme of Tc-114 to Ru-114 seems incomplete. The decay scheme of 6.2-s isomer in I-114 seems very poorly known, and for the 2.1-s activity not well known either. None of these is published in a primary paper. © 2012 Elsevier Inc.


Blachot J.,CSNSM
Nuclear Data Sheets | Year: 2012

This evaluation for A = 115 updates one by J. Blachot, (2005Bl28), published in Nuclear Data Sheets 104, 967 (2005). α are from BrIcc v2.2b (20-Jan-2009) 2008Ki07, "Frozen Orbitals" approximation. © 2012 Elsevier Inc.


Blachot J.,CSNSM
Nuclear Data Sheets | Year: 2010

This evaluation for A = 116 updates one by J. Blachot, (2001Bl07) published in Nuclear Data Sheets 92, 455 (2001). © 2010.


Blachot J.,CSNSM
Nuclear Data Sheets | Year: 2010

This evaluation for A = 113 updates one by J. Blachot, (2005Bl05), published in Nuclear Data Sheets 104, 791 (2005). © 2010.


Patel M.K.,Bhabha Atomic Research Center | Avasthi D.K.,Inter University Accelerator Center | Kulriya P.K.,Inter University Accelerator Center | Kailas S.,Bhabha Atomic Research Center | And 3 more authors.
Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms | Year: 2010

Structural modifications in the zircon and scheelite phases of ThGeO4 induced by swift heavy ions (93 MeV Ni7+) at different fluences as well as pressure quenching effects are reported. X-ray diffraction and Raman measurements at room temperature on the irradiated zircon phase of ThGeO4 indicate the occurrence of stresses that lead to a reduction of the cell volume up to 2% followed by its transformation to a mixture of nano-crystalline and amorphous scheelite phases. Irradiation of the zircon phase at liquid nitrogen temperature induces amorphization at a lower fluence (7.5 × 1016 ions/m2), as compared to that at room temperature (6 × 1017 ions/m2). Scheelite type ThGeO4 irradiated at room temperature undergoes complete amorphization at a lower fluence of 7.5 × 1016 ions/m2 without any volume reduction. The track radii deduced from X-ray diffraction measurements on room temperature irradiated zircon, scheelite and low temperature irradiated zircon phases of ThGeO4 are, 3.9, 3.5 and 4.5 nm, respectively. X-ray structural investigations on the zircon phase of ThGeO4 recovered after pressurization to about 3.5 and 9 GPa at ambient temperature show the coexistence of zircon and disordered scheelite phases with a larger fraction of scheelite phase occurring at 9 GPa. On the other hand, the scheelite phase quenched from 9 GPa shows crystalline scheelite phase pattern. © 2009 Elsevier B.V. All rights reserved.


Singh F.,Inter University Accelerator Center | Singh R.G.,University of Delhi | Kumar V.,Inter University Accelerator Center | Khan S.A.,Inter University Accelerator Center | Pivin J.C.,CSNSM
Journal of Applied Physics | Year: 2011

Origin of the Raman mode in nanocrystalline zinc oxide in the vicinity of A1 (LO) phonon mode induced by energetic heavy ions is reported. The evolution of this mode in the irradiated films is ascribed to the effect of disorder and the high density of lattice defects induced by irradiation. The presence of such defects is confirmed by the reduction in the intensity of E2 (high) mode and band bending of the near band edge absorption. A softening of the evolved Raman mode with increasing in ion fluence is also observed. This softening cannot be attributed to spatial confinement of phonons, as the sizes of the crystallites are large. Therefore, it is explained in terms of the combined effects of phonon localization by lattice defects and the structural strain in the lattice induced by electronic energy loss transferred by energetic heavy ions. © 2011 American Institute of Physics.


Fortuna F.,CSNSM | Borodin V.A.,RAS Research Center Kurchatov Institute | Ruault M.-O.,CSNSM | Oliviero E.,CSNSM | Kirk M.A.,Argonne National Laboratory
Physical Review B - Condensed Matter and Materials Physics | Year: 2011

We report a synergy effect on the microstructural development of silicon specimens as a result of dual-beam high temperature irradiation/implantation. In situ transmission electron microscopy experiments using two different experimental setups have been used, where the primary 50 keV Co+ ion implantation beam was supplemented with either a 300 keV electron beam or a 500 keV Si+ ion beam. In both cases, the secondary beam intensity was such that both beams created comparable overall primary damage. Completely different microstructural response has been found in these two cases. An intensive electron irradiation was found to sharply accelerate the evolution of dislocation structure, only weakly affecting the disilicide kinetics. On the contrary, the Si ion beam weakly affected the kinetics of either dislocation loops or coherent CoSi2 precipitates, but drastically increased the number density of thermodynamically unstable semicoherent precipitates. Possible microstructural reasons for the observed effects and the implications for both dislocation loop and cobalt disilicide nucleation mechanisms in high-temperature implanted TEM samples are discussed and supported by detailed molecular dynamics calculations of annealing of cascade remnants produced by the energetic silicon recoils. © 2011 American Physical Society.


Prakash J.,P.A. College | Prakash J.,Inter University Accelerator Center | Tripathi A.,Inter University Accelerator Center | Rigato V.,National Institute of Nuclear Physics, Italy | And 7 more authors.
Journal of Physics D: Applied Physics | Year: 2011

We report on synthesis of spherical Au nanoparticles at the surface and embedded in carbonaceous matrix by 150 keV Ar ion irradiation of thin Au film on polyethyleneterepthlate (PET). The pristine and irradiated samples are characterized by Rutherford backscattering spectrometry (RBS), atomic force microscopy, scanning electron microscopy and transmission electron microscopy (TEM) techniques. RBS spectra reveal the sputtering of Au film and interface mixing, increasing with increasing fluence. Surface morphology shows that at the fluence of 5 × 1015 ions cm-2, dewetting of thin Au film begins and partially connected nanostructures are formed whereas, at the higher fluence of 5 × 1016 ions cm-2, isolated spherical Au nanoparticles (45 ± 20 nm) are formed at the surface. Cross-sectional TEM observations also evidence the Au nanoparticles at the surface and mixed metal-polymer region indicating the formation of nanocomposites with small Au nanoparticles. The results are explained by the crater formation, sputtering followed by dewetting of the thin Au film and interdiffusion at the interface, through molten zones due to thermal spike induced by Ar ions. © 2011 IOP Publishing Ltd.


Prakash J.,University of the Free State | Pivin J.C.,CSNSM | Swart H.C.,University of the Free State
Advances in Colloid and Interface Science | Year: 2015

This review covers some key concepts related to embedding of the noble metal nanoparticles in polymer surfaces. The metal nanoparticles embedded into the polymer matrix can provide high-performance novel materials that find applications in modern nanotechnology. In particular, the origin of various processes that drive the embedding phenomenon, growth of the nanostructure at the surface, factors affecting the embedding including role of surface, interface energies and thermodynamic driving forces with emphasis on the fundamental and technological applications, under different conditions (annealing and ion beams) have been discussed. In addition to the conventional thermal process for embedding which includes the measure of fundamental polymer surface properties with relevant probing techniques, this review discusses the recent advances carried out in the understanding of embedding phenomenon starting from thin metal films to growth of the nanoparticles and embedded nanostructures using novel ion beam techniques. © 2015 Elsevier B.V. All rights reserved.


PubMed | CSNSM and University of the Free State
Type: Journal Article | Journal: Advances in colloid and interface science | Year: 2015

This review covers some key concepts related to embedding of the noble metal nanoparticles in polymer surfaces. The metal nanoparticles embedded into the polymer matrix can provide high-performance novel materials that find applications in modern nanotechnology. In particular, the origin of various processes that drive the embedding phenomenon, growth of the nanostructure at the surface, factors affecting the embedding including role of surface, interface energies and thermodynamic driving forces with emphasis on the fundamental and technological applications, under different conditions (annealing and ion beams) have been discussed. In addition to the conventional thermal process for embedding which includes the measure of fundamental polymer surface properties with relevant probing techniques, this review discusses the recent advances carried out in the understanding of embedding phenomenon starting from thin metal films to growth of the nanoparticles and embedded nanostructures using novel ion beam techniques.

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